Apple Shampoo

Is there any difference between shampoo for men and shampoo for women? Are they really chemically design for men's scalps or is that just a marketing tool? I've been using shampoo all my life and ... yes, I really have been using shampoo all my life ... and I don't feel my hair has gotten any dryer or more dandruff free because I use a shampoo that's marketed towards women. The only difference I've noticed after switching to shampoo for men is that the shampoo smell is more manly. And... well... Actually... Actually that's good enough a reason for me.